Flag Timeline States and their dates of admission are shown in red. Starting in 1819, the updated flag becomes legal on the Fourth of July following the date of admission. 1775 American ships in New England waters flew a "Liberty Tree" flag in 1775. It shows a green pine tree on a white background, with the words, "An Appeal to Heaven." 1775 The Continental Navy used this flag, with the warning, "Don't Tread on Me," upon its inception. 1775 Sons of Liberty flag. 1775 New England flag. 1775 Forster flag. 1776 January 1 — The Grand Union flag (Continental Colors) is displayed on Prospect Hill. It Read more [...]